| /* |
| * Copyright (C) 2005-2013 Junjiro R. Okajima |
| * |
| * This program, aufs is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * sub-routines for dentry cache |
| */ |
| |
| #ifndef __AUFS_DCSUB_H__ |
| #define __AUFS_DCSUB_H__ |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/dcache.h> |
| #include <linux/fs.h> |
| |
| struct dentry; |
| |
| struct au_dpage { |
| int ndentry; |
| struct dentry **dentries; |
| }; |
| |
| struct au_dcsub_pages { |
| int ndpage; |
| struct au_dpage *dpages; |
| }; |
| |
| /* ---------------------------------------------------------------------- */ |
| |
| /* dcsub.c */ |
| int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp); |
| void au_dpages_free(struct au_dcsub_pages *dpages); |
| typedef int (*au_dpages_test)(struct dentry *dentry, void *arg); |
| int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, |
| au_dpages_test test, void *arg); |
| int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, |
| int do_include, au_dpages_test test, void *arg); |
| int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages, |
| struct dentry *dentry, int do_include); |
| int au_test_subdir(struct dentry *d1, struct dentry *d2); |
| |
| /* ---------------------------------------------------------------------- */ |
| |
| static inline int au_d_hashed_positive(struct dentry *d) |
| { |
| int err; |
| struct inode *inode = d->d_inode; |
| err = 0; |
| if (unlikely(d_unhashed(d) || !inode || !inode->i_nlink)) |
| err = -ENOENT; |
| return err; |
| } |
| |
| static inline int au_d_alive(struct dentry *d) |
| { |
| int err; |
| struct inode *inode; |
| err = 0; |
| if (!IS_ROOT(d)) |
| err = au_d_hashed_positive(d); |
| else { |
| inode = d->d_inode; |
| if (unlikely(d_unlinked(d) || !inode || !inode->i_nlink)) |
| err = -ENOENT; |
| } |
| return err; |
| } |
| |
| static inline int au_alive_dir(struct dentry *d) |
| { |
| int err; |
| err = au_d_alive(d); |
| if (unlikely(err || IS_DEADDIR(d->d_inode))) |
| err = -ENOENT; |
| return err; |
| } |
| |
| #endif /* __KERNEL__ */ |
| #endif /* __AUFS_DCSUB_H__ */ |